When I first did my swap I used the bone stock NA 2.6 bottom end. No oil squirters and 8:1 pistons. Ran 7psi and had minor to moderate detonation issues comming on positive pressure, between 0 and 2-3psi, and climbing long hills.

'87 Mitsubishi L300 - LR4 4.8 swap in progress
'87 Chrysler Conquest TSi
'93 Honda CRX - Open 4wd rally car