[PeteF]

I installed a Paxton on a hipo 289 in a GT350 in the 80s. Instructions said to increase Holley jets sizes by 2, and install nitrofill (plastic) floats (to prevent them being crushed by the pressure). I also had to add an electric fuel pump to supplement the mechanical pump to prevent surging due to drop in fuel pressure on hard accelerations. If you maintain the stock 10.5:1 compression, you will need a ping control device, like made by Carter, to retard spark under hard acceleration. I also added fuel pressure and boost gauges to see what was going on. It ended up working well, but in hindsight it was not worth it to me. You can build a naturally aspirated engine today with just as much power, IMO.