We need to know what the stock valve sizes are to begin with. I know that on my M103 the exhaust valves are already too big in relation to what the intakes are. On my engine I would rather enlarge the intake valve as it is the limitation. (I think we talked about this when you were still a M102 man.)

As far as you messing with the overlap, again we need to know how much overlap you have to begin with before we can decide if you should be messing with it. I feel though it should probably be left alone and you should focus your attention on keeping your exhaust valve size approx 80% of your intake valve size. By doing that you won't have to worry about upsetting things so much that you'd have to mess with the overlap.

I agree that a turbo is a great option!
Regards, Eric

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89 300E "Benzer1" 15.924 Uncorrected
93 400E "Benzer3" 14.200 U.C.
95 E420 "Benzer4"
92 300E "Benzer5" 16.299 U.C. Future turbo CNG
87 300D "Benzer7"
87 300D "Benzer8"
87 300D "Benzer9"
87 300D/70 AMC Javelin "Sidewinder-Benzer"
87 300TD "Benzer11"
06 E320 CDI "Benzer12"
05 E320 CDI "Benzer12A"
71 AMC Javelin AMX 401 "Sidewinder"
74 AMC Hornet 401 "C.K.10" 13.63 U.C.
74 Bricklin SV1 "Presto" AMC 360 pwrd.