engine and drivetrain torn between two engines

[2761876]

I have an early spec tii with 40k on a rebuild. the pistons were swapped when the engine was rebuilt and an 81 e12 head was added. the pistons look like 9-1 piano tops. I have pulled the head and am in the process of replacing the valve seals.

in the garage I have block #2760165, another early spec tii block, the cylinder walls look cleaner than my engine and the 121 head looks good too. the pistons are the proper 10-1 bathtubs, once oversize.

what are your thoughts? keep the matching #engine in and run the 9-1's? or clean up old #165 and give her a go? I am leaning for the later as my car originally came with that configuration.

any thoughts would be appreciated.

[jerry]

my preference is ALWAYS to keep matching engine.

save the other engine for another shell. it doesn't have to be FI either.

[Rastadog]

I would check the 72 block and use that. I have a factory shortblock in my tii. I also have a good motor 500 numbers from my car, both late 73's, which I hope to use for the next replacement. Shortblock was installed in 1986..

[Beaner7102]

If you want to keep numbers, grind them down and restamp them. Then do the same on the other motor. No problems (except you have to live with the guilt for the rest of your life). Beaner7102