Bryce confirmed the roller springs are 220/510 so I'm good to go.

Look forward to firing the 414 back up with the new lungs.

Btw, I confirmed my 414 is really a 416, for some reason my Ohio 4" crank really measures 4.02" stroke anybody else ever find this? I wrote it down on the build but thought I must have mis-read it.

I also modded my (way too small) 1 5/8" x 3" headers to a 3 1/2" collector and a 3 1/2 to 3 X 8" flowmaster reducer to get a little more pipe volume, not ideal but hopefully a little better.