I would do a air cooled 911 engine in a heartbeat (for an R) after all my stupid issues. It would probably be cheaper than getting the suby motor race ready.
Way lighter
No AWIC
No Radiator
No need for a drysump
No need for crazy wiring harness
PMO carbs are simple to adjust
I was a dumbarse and sold a spare 911 race motor to buy a "Race Ready" complete Ej25 engine.