Slant six single, to slant six double.

Cudafishboi said

Love that, which is kinda why I was leaning twords the upgrades vice a whole new engine. Im not racing the thing. Just wanna unlock that potential. Hence the move from 1 to 2 barrels cause I've read its a decent noticeable amount of pick up. Seems the hardest part is just finding the correct kickdown.

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Oh and the #1 thing that brings a 225 in to the 21 century is decking the block and/or head to get some compression out of it. The two I have pulled apart have measured out to a miserable 7.2:1 compression.... Take 0.100" off the mating surface (head/block or mixture of both) and you will get into the high 8:1 range and it will run MUCH MUCH better and be a good base for the 2 barrel to utilize later. My recommendation for a nice street torque engine in order of importance (in my opinion)

1) get the compression up
2) more carb (400-450cfm is plenty for a torque engine)
3) cam like the Oregon Cams 2106 which is mostly like the RV10 from Doug Dutra
4) Split the front 3 and rear 3 cylinders (like Dutra Duals) and put the "Y" where the 2 banks come back together at minimum behind the transmission crossmember. The further back to lower the torque peak goes in RPM. behind the crossmember is about 2300 RPM and back by the rear axle it can push it down to 1500 RPM'ish.

For higher RPM (over 4000) then add
- oversized valves
- little head porting clean up