4-v 318 will have the 360 head with 1.88/1.60 valves and open chambers with low comp ratio.

comes stock with flat tappet cam ,but may be a roller cam block on mid to late pre-mag engines.

2-v 318 has the #302 casting heads with 1.78/1.50 vales closed chambers and will be on a 9.0 to 1 comp 318 starting in 85 with roller cams start in 85 in cars only.

2-v 318 trucks got a roller block/flat tappet cam with #302 heads in 85.

you can up the #302 valve size to 360 size of 1.88/1.60 and with some pocket porting to open the bowl,the small ports will keep volosity up and have more flow with the bigger valves.

360 heads flow more on top but lower comp ratio but with the right cam can be made to work on upper rpm

#302 head will up the comp ratio,make more torque on the lower rpm of your stock bottom end

if you went with complet newer engine you would be ahead by running a retro roller cam in the stock long block

I just picked up a 91' pre-mag roller cam TBI 318 with swirl port fast burn closed chamber 9.0 to 1 comp ratio for my 85 stepside engine swap.

i will be swaping in the lanati VooDoo roller cam and springs along with a LD4B intake(matches 318 head ports) with 600 cfm carb and headers

should be a peppy little 318 by monday

#302 heads 85 to 91

some later ones may have a diff casting # but as long as they are heart shaped combustion chambers its the same thing.