It's a long weekend up here, so I've been with family the last couple of days, time to catch-up.
mroberts - checked the carbs yesterday (627B's), and no problem with drilling the back plate spacing. Thought I had a spare stack there to check fit, but no, so will do that today. Everything looks good so far.
ckasinski - PM reply sent.
65Ch3v3LL3 - Looking at using EFI on my JMR 1080, so yes at some point I will be making just the filter/back plate available. Haven't thought about pricing at this point though.