It's time to swap the wounded 287 c.i./hydramatic for a fresh 400 c.i./200 4R. I know I will need to make side mounts & a new rear trans mount to replace the single center front mount & bellhousing side mounts- no problem. I also want to swap out the stock 55 power steering sector out for a smaller/later 605 p.s. box...What are the 605(round top/retainer ring) boxes in? Must be early to mid 70's G.M. 78-88 G-body is not that style. No one around here can tell me accurately what they came in. I got this info from an article from an old Rodders Digest called Strato Streak, looks like a straight bolt in, even uses a stock 55 non-power pitman arm....Has anyone here ever done this conversion? Please help I am Pontiac illiterate! What is a good drivers side exhaust manifold/header rear exit that would free up a little room on that side? The 55 exhaust is front exit & very restrictive on the bigger engine, I think there has to be a better solution. Things are very tight down there. Please help, gotta have this done by spring!