I think I'd take a look at Skip White's oval port block huggers.
The company has a fine reputation and their SBC HEI is almost cheaper than I can rebuild a stock unit. Plus their HEI is 65k volts! I have gotten an intake for an SBC as well as the HEI and been very pleased with quality and price. The Block huggers may be next!

http://www.skipwhiteperformance.com/detail.aspx?Item=8808-HDR

best wishes,

Les