so i haven't taken anything apart yet so i didn't look to see how well match the case and block ports are... i do have a 1spd. but if i were to open the case and ports on the block further i would have a better transfer. if there is more recommended for me to do instead of porting i would greatly listen any advice. i have now, dellorto 20mm phbg, to 19mm intake bored out to match the intake of the jug, and bored to match the matched side of the carb. stock exhaust manifold mated to a bi-turbo expansion chamber, geared to 10-28. I'm looking to keep my top speed where it is which is 52mph on the flats. but be able to get some extra torque and bottom end pulling power.