AY RICE !!!!!!! .............. answer meh nah !!!!!!!! , ah waitin on your reply to complete meh engine.

 

Bro a #250 will work with a 120 to 130 psi rear oil pressure regulator and shimmed front reg as used in PP turbo engines. You can do a mild inverted funnel shape on the inner part of the exhaust port ( I do this on all of mine ) But it is mild say from inner dimension I.E. sleeve no more than 2mm to 3mm from parrallel works good.

The exhaust and turbo are realy good, should be fine....Now go put that engine together

 

Ay rice , I dont really understand the first part of your answer where you refer to pp turbo engines and the shimming of the regulators , I am running a third gen 13brew , isn't the oil pressure about 120psi ? ,so that the #250 jet would work on my engine ? , also I compared the #250 jet to the bore in the screw in "stopper thing " and it is about the same , why not just leave out the ball and spring and use it without the WEBBER jet since it is essentially the same size bore.