[Sparky dave]

My 69 350 is rated at 255 hp and it has 76 cc small valve heads ( 991) it has a quadrajet but I think as far as I’m aware it’s got flat top pistons as it’s a 9-1 compression engine. ( pre smog era) so I’m thinking if you could bump your compression up using flat top pistons and reach your goal. Just as gm did in 1969. Also bigger cams bleed of cylinder pressure so won’t like your low compression motor much