410'

I have a 410' for the last 3 years never hade problem with it eacept for oil leak and prestone leaks at both heads (gasket)

engine is 1973 la block
scat rotating
w2 race heads
crane roller .630 lift .272 int .282 ex(to much)
harland sharp 1.6 roller rockers
custom push rod
m1 single plane intake (bad choice)
franck lupo converter(4200) not enough

if I were you I would try to find better heads
thats true its a street engine but the heads will hold you back