I used an ARP full engine set. I may have had to use a few washers to fit the performer RPM intake. I used a full engine kit because I was building a complete motor and it was the easiest solution. The intake bolts are really just holding it in place unlike the bolts for the mains and heads that are holding against the engine operating loads. I’d just get SS or chromed bolts from the hardware store if I did it again.

3D printing is already accessible to everyone now. I built a 3D printer based on parts from a kit for less than $200 two years ago. The printing filament material is advancing rapidly. Higher temperature and stronger materials for usable parts are now available but typically require higher print temperatures and an upgraded printer. But I am just talking plastics. 3D printing metals still requires expensive equipment.