68 Yenco clone

I suspect you'll be looking for a four bolt block. The L88 in the first design configuration is a long way away from the L72 and the second design L88 is even further away (more radical). I think though in your own best interests, it might be good to start gathering printed info (books, magazines, etc.) on these cars and other Chevrolets of the era. Even though I do this for a living, I'd really suggest you dig deeply into the research part of the equation first (just like teachers I guess -- in reference to one of your earlier comments). If you're determined to build an accurate clone, there's still a rather steep learning curve that is likely going to be far greater than a few questions and answers posted here.

Best of luck.

Wayne [img]<<GRAEMLIN_URL>>/smile.gif[/img]