Boss 429 is a different series 390 is an FE and the 429-460 were "385" I think, not to mention the boss heads are a ton bigger. As to the cammer there was one in a Thunderbolt, think it was a Mickey Thompson car so with enough grease....Pretty sure someone is making reproduction ones if you got the $$$. Unless you have to have a big block how about a http://www.summitracing.com/search/...-427-C-I-D-535-HP-Crate-Engines/?autoview=SKU
