Hi, I’ve been reading a lot of great info on this site. I’m working on putting together a new combo for my 64 chevelle which I do drive on the street, but am taking 1/8 mile performance more seriously. While I’ve put together successful street combos in the past using pretty basic setups, this engine will be my first small cubic inch and more race oriented. I will have to very carefully match parts to achieve excellent performance. Im going to provide some info below which may help narrow down what to look for in cylinder head choice. Here is info on the car: 1964 Chevelle Malibu 3380 race weight 12 bolt 4.56 gears Auto gear m23 2.56 1st 26x 10.5 et streets . Here are some intended specs for the engine: 3.935 bore x 3.00 stroke Approx 13.5:1 comp Will run on E85 Solid roller cam specs TBD Based on requirements of heads Single plane intake TBD based on head/cam choice. With the relatively low gearing and short tire, im not too worried about sacrificing low rpm performance if there is potential for excellent high rpm power. I cannot run intake valves larger than 1.94 due to the small bore. Ive been thinking about possibly getting a bare set of trick flow super 23 175 heads with 56cc chambers, but could use advice if those would be a capable head for a small cubic inch high rpm engine. Thanks!