Lord. 100% sure it’s the only 292 with  +.040” in 7 cylinders and a 312 std in one hole making it 4/10” bigger than a 292+40. The replacement piston is within 2 grams of the original piston. Doing a .010” hone in one cylinder in the car was not fun especially with protecting everything else, keeping  it clean, and runout at less than 0005”. Skirt clearance is at ,0015”.  I’m glad it wasn’t #4 or #8. 

56 Vic, B'Ville 200 MPH Club Member, So Cal.

I’ve had the car out 3 times. No leaks so far or noises I was not expecting. Bypass plug has been removed. Reaches temperature a little faster than before and is steady unless sitting at stop lights for a long light. Outside temp had been 80+ goes right down when moving to what is normal on the factory gauge. Exhaust temps are all about the same right at the cylinder head. The engine has a slightly different sound I’m guessing getting carbon build up off the intake valve may be the reason. Sure glad all my heater parts are removed and I do not have a vacuum booster. Not looking forward to ever doing this again..

56 Vic, B'Ville 200 MPH Club Member, So Cal.

Update . . . . 2 things:
#1. The engine hasn’t run this good in years. Idle is very smooth which at times in the past shook on occasion. It is also very quiet; I’ve always set the lash at .019” and could hear some noise so hopefully this type of work is done. I’m sure cleaning the carbon build up off the intake valves helped with that. Maybe the de-burring of the oil passages in the heads helped. 
#2 . I removed the bypass plug which had been in for 8-9 years when I was trying almost anything to keep cool in traffic. A few members here said it was not needed and they were right. The fan speed and shroud came much later and probably solved the problem. The engine now heats up quicker and when reaching the temp for the thermostat stays for the most part at temp and maybe moves a needles width. 

56 Vic, B'Ville 200 MPH Club Member, So Cal.