these are Imco's big dogs. risers and manifolds $1300 these have never been ran. half way bolted on by last owner. they've done nothing for me but collect dust. i never finished the motor they were intended for. my loss your gain.
yes,i still have them. they are for BBC. here's a link. scroll down most of the way for "powerflow plus" gives info there. http://www.imcomarine.com/pages/exhuast.html
if you want them PM me or call 714-791-1383 Jason lv. msg. thankyou.