Are 986 and 987 interchangable?

[Shoestringracer]

Sorry title should have said "engines" but I can't seem to edit it.

If my 3.2 986 blows up, how easy would it be to fit a 987 engine? Interestingly a 3.4 would be good but I might want to go 'down' to a recent 2.9 as it suits hillclimbing / sprinting class system (the highest class is "over 3 litres" which puts my car in with some much faster machinery, not least a pair of GT3s in my local club). Assuming you buy a new one from Porsche and therefore get all the new ancillaries etc, is there much differenc in price, does anyone know?

Thanks

[Trev450]

I compete in sprints and the 'unlimited' class is over 2600 cc.

[Shoestringracer]

Trev450 said:

I compete in sprints and the 'unlimited' class is over 2600 cc.

It varies from club to club but, in my expirience most clubs round my way use over 3 litres, this is the MSA standard, I believe. Anyway, my local club (Borough 19) uses 3l+ as top class for road cars. I once competed at Harewood and top class was 2l+. I still didn't win!