Ross, there is a current thread about the 2287P pistons.

Thanks Jay, The motor is all together and running in a driving car so I was hoping to ID it as a 428 with the piston, I will take the trans out in cooler weather.

This build was from the mid 80's so the TRW's sound like it, thanks.

Rockers and cam look chrome plated.

I got the idle down to 500 and may be able to go lower but when I turn off the key it still runs on and has the feel of not stopping unless I intervene.  I looked at the secondary butterfly and its looser than I would like (rotationally) if the vacuum diaphragm doesn't hold the butterfly tight (closed) is there a spring that handles this on a constant basis ? Im not seeing anything obvious that would be supplying fuel the float levels are spot on new and correct return spring on the primaries, could bad bushings on the throttle shafts contribute to something like this ?

Brent, did you get the finish on these heads from a wheelabrator machine ?

I have a new to me engine that appears to be a 390 with CJ heads a 80's Comp 268H cam and unknown compression  but I believe it may be somewhat high the timing is at 15* initial and the vacuum advance is working. This is being called a 2000 mile motor the problem is its running on after turning off the ignition could high compression be the cause of this ?