I have a Dellorto w/a RacingBeat upper mainfold mated to a lower 87na manifold.

Is this a direct swap to a 84 GSL-SE 6port motor..?

 

Run a fuel pressure regulator with a return (maybe a new low-pressure pump) and yeah, you're nearly there. I'll take your injectors!

 

Yea I know all the basics...

I'm trying to get a heads up if the lower intakes to block are the same bolt pattern... Comparing a GSL-SE to a S4. My memory tells me there are slight differences, but my friend says there is not..???

Or if the lower intake to upper intake patterns match... Again comparing a GSL-SE to a S4 so I could just drop on the RB mani.

 

I believe their is a slight difference in the port pattern.
If you look at Racing Beat's website it is listed as different part numbers.

Hope this helps

 

RB is a good source to compare and also look at Mazdatrix's website. They have all the pics of the intake gaskets so you can compare the intake ports and patterns.....

 

I use a Barry Grant fuel pressure regualtor on my GSLSE with the stock fuel pump feeding a holley.