318 build.

with what you have, a bunch of converter and gear might make it passable. the compression is still gonna make soggy on the bottom. but it'd be fine around town and sound cool.

honestly though, i'd say ditch the single plane and throw on a air gap with 600~750 add some stall and gear and it'd probably be a hoot around town.

if you want to do something to correct the compression, then it's a whole different ball game.
Yes it is the dual llane with the gap