I have built those engines for IHRA Crate Motor classes. Made good power with legal heads. Don't buy a complete engine. There is too much to throw away, Esp. the powdered rods. I've seen some of those stock valves come apart,too. Buy the components you need & spend the money to build a blueprinted one. Give me a call & I can put you in touch with one of my customers that can give you years worth of experience.
Adger Smith Performance Engines
2802 W 7TH St
Texarkana TX
adgersperf@aol.com
www.adgersperf.com
903 794 7223 shop
903 824 4924 cell