"Converter change" how much improvement...

yeah go ahead, why not.

I usually do that beyond 3200+stall or big blocks.

say.. what size are your u joint bolts? or clutch bolts, bell housing bolts etc...

but it won't hurt anything.

I ordered it.

I have the small u joints, i'll be installing the "brute force" joints shortly, also going to install SFCs @ a loop.

The bell houseing bolts are stock, i've never had issues in this area, i do still have the factory torque bars from the 318 that connected from the trans too the engine, but i don't know yet if they will fit the Magnum block.