I installed a chevy HEI in my 2F. I used the guide in the tech section right here on IH8MUD. It works well, though I didn't get any huge MPG gains. (I think my poor mileage is due to my bad compression on two cylinders, though.) Starting is much easier and my low compression cylinders don't foul out as badly as before.
Read a little about the HEI swap. Sounded good but I was slightly nervous about the gear swap and rigging up a hold down clamp. :-/ Seemed easier to leave the stock dist in and just slap the Mels kit on it. No real fabrication or guess work required. Am I getting worked up about nothing or is this going to be a real issue?
TPI sells one for the non-usa distributor. $70 bucks,... have one in mine, works like a champ. I get sh!tty gas mileage,(~7mpg) and no noticeable difference, but she runs looots better, smoother now. Haven't checked my compression as of yet. Figure I have two cylinders with plenty-o blow-by.