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From what little Poncho exposure I've had, I tend to lean towards the 455HO. In Pure Stock competition the quickest Ponchos aren't the RAIV, but the RAII's and the 4550HO's.
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Rob, I think you're confusing a few engines.
I am not sure ANY 455 1970 Poncho has run in the races where I see you race. These 1970 cars may be called 455HO in Pontiac circles, but not on the car. It always says "455 cid" and if you want to get picky, it's not a real HO car. They have nothing in common with the 455HO introduced the next year, which was basically a RAIV 455 but with low compression. The regular 455 was still available, and it received the same "cid" decals like in 1970. True HO cars received "455 HO" decals for 1971-72.
They made them in numbers marginally greater than 1969-70 RAIV GTOs, but when you factor the couple thousand T/As built, they are MUCH more common. I would not discount a RAIV just yet.
