Not sure if you got a starting point for the Webbers?
I found this in my garage...it's the specs on the 48 IDA's I ran on the McLaren. It was setup with a 360 chevy small block with aggressively ported turbo heads...as I recall 2.02 intakes and 1.60 exhaust. My guess is these might flow close to what a 351c 4v head would flow.
42 chokes, Idle Holder 120, Jet 50F10, emulsion tube F7, top jet 140, bottom jet 185.
I don't recall if this is where I started or ended up...but it's a very good starting point and there wasn't a big mismatch from where I started and finished.
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