Want to build a 77 360 suggestions please

Steve Agrella said

Compression 9.5
Gears 343 81/4 rear end
Tires rear 275-60r-15
Front 245-60r-15

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Are you sure the compression ratio is 9.5:1? If you're going by what the book says, it's likely way lower, which may explain the 'gutless' comment. What pistons are in the motor?