Of course it's your car so do with it as you want.BUT don't just throw it together because it is free.Take sometime and do it the way you REALLY want to do the car.I have a soft spot as I have one of those 36 coupes,mine has a 440 sixpac in it and it's great and I do get alot of complements for not sticking a chevy in it.But I orginaly wanted to run a early Hemi (which I now have) but it was alot more work to put it in at the time and I took the easy way insted of the way I really wanted to go,and of course I regret not doing it the first time around.
Good luck either way
Joe