Ok, so does anybody know if the FG inlet manifold have the same bolt pattern and port spacing as the BA-BF?

And does the BA-BF manifold have the same bolt pattern and spacing as the E series.

I know the exhuast is different from e series to ba-bf but how about the inlet?

Thanks for any help guys.

I think its the same but im not 100% sure

all the twincam stuff would be the same.
single cam is all the same, but different to twincam

No! The lower half of the BA intake manifold is different. The intake runners have the same oval port shape as the exhaust where SOHC engines have round ports. Bolt patterns are different too. BUT, upper halves of the intake manifold can be interchanged. For example, an EF upper plenum can be bolted to BA lower intake runners.

Six cylinder FG intake manifolds will bolt up to a BA/BF DOHC head.