We got a 63 425hp engine about this time last year. The plan was to rebuild it over the winter and use it to replace the one we borrowed from the 62 Impala. (We needed that one for the 55) Anyway, better late than never we finally got it running. We got the engine from one of the members, elteeron. It was in great shape but it was apart so we just gave it a new set of valves, rings and bearings etc. We wanted a pretty smooth idle because the car's mainly a cruiser so we installed a smallish hydraulic flat tappet cam with 224-234 @.050 duration and a 112 lobe separation angle. It idles very smoothly and seems to run well but we didn't get a chance to do much test driving because of the wet roads. I think it'll be fine. The chrome on the valve covers wasn't great so we bead blasted them and painted them silver grey. By the way, We didn't run into any problems breaking in the new cam. We used Shell Rotella T 15-40 oil plus a can of additive that they had at the local speed shop. It's made by Comp Cams. We also ran it in without inner valvesprings.