94 roller 351w with stock pistons
F303 cam
1.72 roller rockers
Trick flow twisted wedge heads (older model, non adjust. valvetrain)
The heads have been decked 1/10,000th
If it is too much lift, If I use stock roller rockers, will I be in the clear?
I have no idea about a 351W but I know if it has the same valve reliefs as a 302 then it's gonna be VERY close.....it will most likely hit.
If you use stock ratio rockers (1.6) then the clearance should be fine. By the way, the stock rockers shouldn't be roller unless you meant just stock ratio.
As Mike Yount has said countless times, peak lift has nothing to do with P/V clearance. When the valves are at peak lift, the piston is at the bottom of the bore. You encounter problems during your duration and your overlap.
Without knowing 100% about your valve reliefs, you will only get an accurate answer by claying the pistons. Do you think its worth the amount of time to clay them? I sure as hell would