YES. That would be a direct swop / bolt in.
GMC brand rims will fit a 86 Chevy c10.
You'd have fewer complications if you stick with 86 and older.
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YES.
Yes
yes it will, they are the same exact engine
yes it is
Should fit it's the same generation motor.
YES it did.
Sure it will, just get your motor mounts made and swap the motors
nope, the 85-86 motor is angled, the 87-92 are not. and the cylinder mapping is different as well.
It seems like there might be a misunderstanding in your question, but if you're asking about the average of the grades 83, 86, and 86, you can calculate it by adding the grades together (83 + 86 + 86 = 255) and then dividing by the number of grades (3). This gives you an average grade of 85. If you meant something else, please clarify!