Thanks again for info - I miss-labeled SPI in my previous post. I want to make sure I understand sub-piston induction correctly: you would use cylinder shims to eliminate the gap below the piston skirt to optimize pressurized systems AND/OR when using a muffler? Otherwise for stock config, you want SPI? I'm lazy but it'd probably help for me to just read the instructions that come with the shims and besides, its more fun to ask here...

I have two more untouched Tee Dees and KK parts, so I can rob or swap parts if needed. I plan to go to the Lebanon flea market; I'll try to keep my eyes open, but will primarily be trying to sell stuff.

BTW, I always thought (perhaps incorrectly) that the narrow neck cylinders were necessarily single port style and the thick ones were dual port bypass based on the Cox stuff I have and that Black Widows and Tee Dees used the dual port ones.