Helping a friend do a cam swap in his 383. Currently has a 280/474 purple shaft. He picked up a used comp Nostalgia cam that is similar to the 284/484 cam. Looking for a little more aggressive idle is the reason for change. 4 speed 3.91 all manual B-body. L2315 flat top pistons. 800 Edelbrock, Performer RPM intake, 516 heads with smoothed up ports. Imo the cam should work well.

https://www.compcams.com/nostalgia-plus-239-246-hydraulic-flat-cam-for-chrysler-383-440.html


With this being a used cam, from a trusted source marked lifters accurately. I assume, to be safe, that a normal flat tappet break-in procedure be done with cam/lifter assy lube and break in oil?
Its not a major jump in size but, Should we worry about piston to valve clearance? Thanks