I have not had the chance to run it but I went with the Daves small body HEI. He converts the points distrubutor to HEI by mounting the HEI modual on the bottem of the distributor. That way you will never get stranded by a bad mail order part. Pertronics seems to get a lot of mixed reviews. Cran also sell a similar unit with a built in rev limiter. The story I got was the rev limmiter fails on many of these units and they won't replace it. Dave did a excellent job in my opinion. He rebushed the shaft, polished the outside and made it look better then new. He is a little sticky on how you send it too him but his work was excellent in my oppinion and it looks stock.