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Ive had a few 360's strong motor. If your tearing it down anyways why dont you install 390 crank/pistons etc. and make her into a 390 instead of a 360. Just a thought. Good luck.
Yeah think about that after you get your ugly butt over on the FE engine forum! :)
I've got a 360FE and got it rebuilt by "the best;)" and man does it ever run good... more power, more usable power band, better gas mileage, better oil mileage.
Heck, it even smells better. :)
The original valve guides were crap and the valve seats were simply hardened surfaces on the cast iron. Those two fixes alone will make the old FE iron worth keeping. ...but not saying it doesn't need an over haul. :)
All the heads and intake manifolds on FEs are good ones, only the right hand exhaust manifold is not what it could be and on my '75 360 T-18 the Y pipe innards would have been a joke if it would have been funny somehow. :/
As far as the right hand exhaust manifold goes, it doesn't hurt anything, if you bop around on torque. A 390 crank and rods will help you bop around on torque like you mean business. ;)
I pulled mine out to reseal some stuff (oil pan, head gaskets, front seal, ect) and I looked at the rod and main bearings. the showed some pretty bad, but even wear. slaped in some new rod and main bearings, resealed, and slammed it back into the truck. It made a dramatic change in the oil pressure. ( I also replaced the oil pump and cleaned the pickup.) I'm getting around 15-20 psi at an idle and 40-60 psi at 3000rpm depending on how cold it is. The new seal kit on e-bay was $20, fel-pro head gaskets were around $30 (don't like cheap head gaskets) and the bearings were around $100. I used clevite frome The local parts house. Took me one weekend to do it. 4000 miles later, it is running great. Drove it to baltimore from WV. No problems except for a tranny output seal leak, which I have fixed. If you are as tight on loot as I am, that would be an inexspensive way to fix your problem.