My street strip car has probably the next sized cam up from yours with 272/278@50, & 660 lift with 1.6 rocker arms. I use springs that are 230lb on the seat & have a spring rate of 555lbs. I'm installed at 1.95 & this engine revs out to 7000 rpm. I've just put the engine back in after I pulled it after 6 years of racing & the only things I changed were the valve locks & the roller lifters. And I only changed those parts coz I thort I should since its under a bit of stress.