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Some KB pistons are listed as +6.0cc flat top which is 'out of the hole', just as early 340's. With block zero decked, are your aluminum heads full diameter chambered, like stock head? or or small chambered, like many aftermarket heads. Could have insufficient piston to head clearance! At 11:1...

Indy intake manifold

Comp Cams has new lifters with relocated tie bars to clear the valley better with little or no clearancing for 59 degree blocks. Don't think 48 degree has near the problem.