After a standard rebuild, my 390 runs like crap, cannot get above 3000 rpm without lifter clatter, its like it has low oil pressure and lifters are pumping down (hydraulic cam), but its got a high volume pump with lots of pressure.
its got me stumped. all other areas seem normal. pulls 17" vacuum with a .475 lift cam. soon as you try to rev it, it starts breaking up with lifter clatter, Help !!