Well, I'm going back from a BBC to a SBC. And I know I'm not going to be happy with the power at this altitude so I'm thinking about doing something like this: Here's another style of header but I doubt it would clear the accessories: Would basically be a twin turbo on a 350sbc. No intercooler so there's less piping to be worried about when the K5 is flexed. Stand alone EFI like Accel or Holley with MPFI or maybe TPI system with larger injectors but still tuned correctly with stand alone or a chip burn. I was thinking single turbo but these headers are fairly cheap and there would be less fabrication needed. Looks like it should clear everything. 3" downpipes look like they should clear. Boost would be on the low side so the heat going in the engine wouldn't be too bad. I think if I had everything coated, the heat wouldn't be that bad under the hood. I've seen some kits go for $3k but I think if I keep this on a budget and do most of the fab work myself, and find some used turbo's, I think $1500 is possible (not including fuel management). Here's a dyno from Banks Twin Turbo kit which is WAY overpriced but it gives a good idea what is possible on a SBC with a couple snails... I'd appreciate everyone's thoughts on this before I make the plunge.