hi i have a 92 z28 convertible with stock lb9 and i was wondering how big of a camshaft i can go with stock heads... or can that even be accomplished? i would like to just buy the cam and not the cam kit $$$ or with getting the cam kit ,valve springs,pushrods,cam,timing chain do you have to get new valves and port etc? i would like the cheapest solution for price and power

 

also what lifters do i need for a 92 roller? flat tappet?? and also can i reuse the 19 pound injectors or do i need bigger ones...the upper intake is being ported to correlate with the cam but will that suffocate the lb9 heads ^^^ why im asking the question about the cam to stock heads question