I have a 1991 mustang 302 with stock cam and 1.7 roller rockers and want to put a e303 camshaft in it. With their be any problems with piston to valve clearance. I know the b303 with fit but i want to put in the biggest cam possible without changing the heads or pistons.
that will make .532 lift I run an X cam that is .542 and have run an F/w1.7 rockers and it cleared fine but that doesn't mean yours will. You will need to upgrade springs on your heads though use the Crane 44308 kit
I run an e-cam with stock heads (self ported), stock valves and springs, and 1.7 RRs. It's a basic upgrade over stock and you will have no issues with clearance...but when I do it all again, I will be going with 1.6 RRs and a better cam.