You don't really need to under drive the water pump or alt you won't gain much there. weather you go rockers or cam, a 3.5" pulley is a bit mild as well, with a thought out intake and free flowing exhaust a 3.4" pulley wont be a problem, most likely 3.2" with a cam or rockers
Aren't the Metal LIM gaskets OE Series 3? I'm not sure but check it out.
For what it's worth I wish I did a cam while my motor was out, But it's understandable to not want to get into all that.
Skip any stock intake parts, maybe stock LQ4 truck intake tube but run a open K&N type element behind the rear 1/4 The cooler the air coming in and the faster the exhaust gets out the less chances you have for KR
Skip the rockers and the under drive pulleys, do a 3.4 SC pulley & a 180or 160deg T stat
A good scan gauge is a nice thing to have as well, I have a Aeroforce gauge with a Innovative LC-1 feeding it 0-5v Air fuel signal so I always have KR & AF a short glance away.
------------------1986 SE 3800SC/4t65eHD (email@example.com) I'll Sell it if you like
1985 GT 3800SC (swap in progress)
[This message has been edited by 1fast2m4 (edited 07-21-2013).]