Lets get some philosophical stuff out of the way.
First there are no electric motors that emulate a glow engine. This because by their nature they produce power very differently. You can see this in the shape of the power curves for both motor types. You will notice that they effectively have power curves that slope in opposite directions. You will need to be aware of this as you start to match the power to the air frame. With glow if you wanted more power you went down on the prop load. With an electric motor one adds to the prop load to get more power.
Today I see no reason to use analog servos, well buy any that is. Today most 20 to 30 gram servo will out perform the S148 of old. I’d like to see you use a servo that is at least as fast as 0.10 sec/60°. With today receivers having a gyro native to them the speed is often needed to keep the gyro induced oscillation in check. Love the KST brand as they are high performance combined with great value. the Hitech 225 is a good old school servo but today its modern 5245 brother is better
Also no glow conversion will work out as well as a design initially designed for electric. An electric airframe often ends up being about 30 to 50% lighter than its comparable glow brethren.
The Sig Fazer with the OS 46 was probably running an 11 to 12 inch prop and not producing much over 1hp to 1.2 hp on that small a prop.
http://www.sigplanes.com/SIG-Fazer-Kit_p_64.htmlTo get an honest 6 minute run time you will need a large power system. This means a motor that is about 280 to 300 grams in weight and for the Fazer you will want about 800 to 900 watts.
You are looking at a 500kv motor on a 6 cell lipo battery pack. this will drive a large 14 inch prop. At about 1/2 throttle you will have about the same performance as the OS46 equipped Fazer.
I like to run 2 3cell packs in series with a capacity of 2200 mAh to 3300 mAh.
Now for the recommendations.
Motor:
https://hobbyking.com/en_us/turnigy-aerodrive-sk3-5045-500kv-brushless-outrunner-motor.htmlESC:
http://www.castlecreations.com/en/talon-1/talon-60-6s-25-2v-60-amp-esc-with-20-amp-bec-010-0163-00http://www.altitudehobbies.com/flyfun-series/hobbywing-flyfun-series-100a-sbec-v4-eschttp://www.altitudehobbies.com/flyfun-series/programming-card-for-hobbywing-escsBattery;
https://alofthobbies.com/gens-ace-3300mah-3s-25c-xt60.htmlServo:
https://alofthobbies.com/radio/servos/kst-servos.htmlhttps://www.servocity.com/hs-225mghttps://www.servocity.com/hs-5245mg-servoGive this a good look
https://www.precisionaerobatics.com/product/addiction-xl-arf/To get this big a power system in the Fazer might be a problem, ground clearance with the 14 to 15” prop.
A 4 cell option would be a 700 KV motor. But this might fall short of the 6 min requirement
https://hobbyking.com/en_us/turnigy-aerodrive-sk3-3548-700kv-brushless-outrunner-motor.htmlWith a 3300 plus mAh battery;
https://alofthobbies.com/tattu-3700-4s-45c.htmlYou can drop down to a 50 amp ESC.
And 15 to 19 gram servos should still be fine.