I'm having trouble finding info on how to dial-in my McLeod bellhousing for an LT1 and T56. I've found threads were people occasionally say "yeah, you need to do it" but no one chimes in who's actually done it and says what's all necessary. Where do you measure on this thing? It was my understanding you have to measure relative to the flange that bolts to the trans, yet there's no bore to measure?
Here's a pic for reference: