The best stroker 408-416-426-435 combination in stock 68 340 block

bone stock 1970 340 - 280hp. 800 Ed afb - 314. Hooker 1 5/8" headers - 326. RPM air gap - 350. Comp 268/280 .477"/.480" and 123 lb. springs - 390hp by Steve Dulcich