Pulled a 215 Buick from my 78 Sunbird wagon and am installing an 84 3.8 Buick which is a 215 minus the front 2 cylinders supposedly. Bottom half of motor mount was left in place and am hoping the new top halves from rock auto will be correct and bolt into place . Also ordered a flywheel from them for a 79 buick century 3.8 which was the closest application I could find a flywheel for there. Examined the 84 flexplate and the flywheel and find they both appear to have weight reduction in similar locations. Will take to machine shop to see if they are weighted the same. Just thinking I might be able to rig my own setup with a disk a string and a reference weight standard set. Suspend horizontally and see if both dip the same degree with respect to the alignment hole and if both can be leveled by dropping the same weight on top in the same location. I know V6 balance is supposed to be tricky ... I think that would tell me if I should give this a try. I think the machine shop charges 200$ to modify.
Looking at some headers for the v6 and wondered about fit. I found a set of banged up Gebler stepped headers which were expensive headers when new, these appear to be tuned and appeal to me more than the Hedman offering which is the only other I find. Wondered if anyone here might know of the tight spots doing 3.8 in an H-body ... actually it looked pretty roomy around the v8 when it was in there. I think the biggest problem would be if they are too low when they go horizontal to collector. Really they dont look any lower than the Hedman.