I have used a Montero block for a turbo conversion. The tricky part is drilling and spot facing for the oil squirters. I still have a the tooling I made so It can be done on a Bridgeport style mill.

Past that the bottom end just need a hardened crank and the right pistons.

I have built 2.6 engines with several compression ratios. One was stock 7 to 1 with the turbo. It could take a lot of boost with out being fule limited.

The 8.7 to 1 motor I built did take a bit more tuning. I re-curved the dist to slow down the initial advance. The stock starion dist comes on very quickly since at low speeds without boost the extra lead helps cover for the 7 to 1 CR.

That worked fins if the the max boost was 10 PSI. On California 91 octane the detonation sensor wold drop the boost back once in a while, but it was not too bad.

The last motor I built has a 8 to 1 CR. That seems to be a decent compromise. It has enough CR to be a NA motor but running 12 to 15 PSI boost is not a problem.

Kevin