The L78 was a 396. The L72 was a 427. And so was the L88. The first design L88 used a closed chamber 12:1+ piston with a matching aluminum head; second design had an open chamber 12:1+ piston with a matching aluminum head. L88 cams were different (considerably more aggressive) than L72's. Carbs were larger. Intake was the same, but the divider was milled. Different oil pump. Larger diameter pushrods and a few other details. Tell you what: Try going to this site:

http://www.nhra.com/competition/blueprints.aspx

You can download basic blueprint specs on the engines, as they apply to NHRA (class) drag racing. It's not the ultimate source, but it'll give you a toe-hold on the info. [img]<<GRAEMLIN_URL>>/grin.gif[/img]

Take care...

Wayne