[jdean]

Miles, what are your cam specs right now? If it is not too wild on lift and duration, There is little risk that it will not fit. On the exhaust, the ports are raised about 1/8", so your side pipes will be that much closer to the top edge where they exit the body, not enough to mess with your mounting supports for the pipes.

You could go ahead and buy the heads, then mock them up to measure piston clearance with your current cam. You need to check pushrod length again too. Then you have a choice (while the top half is already disassembled) to keep the current cam if clearance is tight, or buy a new one if there is enough clearance. Either way you should get some more power out of the deal.