Ok my 3zj I'm overhauling originally had a square port head and manifold. I just bought a CAT round port head after taking response/spool/performance into consideration. Now is there a round port b/c model exhaust manifold or do i need to go straight to an E manifold? I've been searching the net all weekend for a round port non-E manifold and found nothing. I have to get something bought/shipped tomorrow hopefully to get this running this week. I've read alot on putting an E manifold on this head and if so should I put the sleeves in also?