Are Force 70/90 crank cases interchangeable?

[DaveyLC]

I have a tired Force 90 (triple carb) mounted up to an inboard SportJet and I’ve just acquired a very tidy Force 70 (single carb) .

My question is are these blocks line bored or can the front/intake side be swapped? I’d like to use the crank, piston and cylinders from the 70 but the intake side from the 90.

Thanks!

 

[racerone]

Check and see if driveshaft splines are the same.----Yes , they are line bored.

 

[DaveyLC]

Check and see if driveshaft splines are the same.----Yes , they are line bored.

Thanks, I guess that’s my plan scuppered