Need info on degree angle of block for trans mod.

Dont want to seem hung up on this, however with my carb base level, the block is at 3° angled down. When this stuff was built new wasnt it figured around the carb being level? I got a friend who buds dirt track stock car MoPars. Starts off with square steel tube builds his chassis from that, and uses bolt on seam welded street K frames, and stock A body rear rails, and leaf springs. He works off a level surface plate to build the chassis. I can also ask him how he does it. Maybe get more insight into this matter.

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