With the gas available at the pump today, no way you can run enough compression on a street engine that you will pull a web. On a 9 or 10 to one street engine, the 2 bolt blocks will do just fine.

I'm with Tech, far as I know all 2 bolt chebbie blocks are created equal. Good or bad is determined by the quality of the machine work done to it and the skill of the man putting it together.