Aren't there 1.7 ratio rockers for the series 1'*??
And how about the coolant fan and t-stat like mentioned and advancing the timing a few degrees? (gonna have to get a chip done and run on higher octane)
Do any of the larger supercharged series 1 throttlebodies bolt up to the L27 upper intake? Probably gonna have to either fill the tb coolant passages w/ metal epoxy or make a non-paper gasket b/c of vac/coolant leaks. also you are probably gonna have to get a mini air fuel calibrator from zzp(website down there vvvvvvv) or get some chip tuning.
Put some 97+ ignition coils onthere?
Get a ssei exhaust Downpipe back from a wrecker? Thier stainless and 2.5" instead of 2.25".(some one chime in if i'm wrong) Although i believe you don't have a resonator and might be pretty free flowing already
I'm just throwing what ever i can think of out there so if ya wanna disagree go for it.
Convert it to the 93+ style engine so you have an egr and won't have to worry about burning valves. Plus in theory, you should get better gas mileage. You'd need a bunch of stuff like a diffrent front exaust manifold, lowerintake manifold, upper intake manifold, egr valve, 93 computer, harnesses... (I actually have no idea how to make this swap it'* only a suggestion to look into)
Definatley a nice COLD intake shielded off from engine bay heat.
The electric waterpump for the series 2 engine sold at www.zzperformance.com
has been verified to have the same sized gasket. BUT that'* it so far. clearances have not been checked.
That'* all i can think of. Hope that sparks up some discussion and helps you out.