Symptoms of wrong cam installation

its 260/264 at 50…. Its big
296/299 advertized

compression test is a good idea. Its not my car, i can only suggest tohim what to do.
He is hard headed…runs in the family..lol
LOL I can respect that. Yeah that's a whole lot of top end for a 340 in my opinion that is (dome piston) territory or extensive milling to the heads and even with that I wouldn't expect that motor to start coming on till about 4,000 RPMs to 8,000 RPMs with a sweet spot between 55 and 7500 or so