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Jim,
Just to be clear, the "firewall" dimension I gave you is the flat, leading edge of the cowl. I took a couple of pictures showing that the firewall (flat on ShowMe) is set back 1.75" from that leading edge, and a second showing the clearance on the HEI dizzy. I think you'll find that the leading edge of the cowl value will be pretty consistent between suppliers, but the "setback" may vary a bit. I had to cut out the tranny hump and modify it to clear the bellhousing on this one and may have to relieve just a bit to clear the distributor hold down screw boss.