yeah no point haveing a cam that gets humming at 4000rpm to only have the inlet manifold fall over soon after.ive been playing with a 304 with bananas and cam with shaved heads and port cleanup duel exhausts and it really falls on its face around 5400-5800 rpm and a 70mm throttlebody is pulling vacuam from the minute you go full throttle all the way to redline its not big enough
355 will make all of the above even worse