2.0 Type IV Vintage Race Engine Options

[jdahl]

I'm building an engine (2 actually) to run in my 914 for SVRA Group 3 road racing. I've done a lot of research, built a spreadsheet, shopped around, done more research, etc. Before I start spending money on parts, I would appreciate any experienced advice/critique of my build(s).

Conservative
Bore 94 mm - flat top Type 1 "stroker" pistons 35mm pin height
Stroke 71 mm
Rods 5.325"
Heads 59 cc, 2.0 42/36 valves, single valve springs (porting/polishing TBD)
Rod Ratio 1.905:1
Deck Height .04" (1mm)
Compression Ratio 8.5:1
Cam 86a

Creative
Bore 95 mm - 14cc custom dome pistons 25.8mm pin height
Stroke 71 mm
Rods 5.7"
Heads 56 cc, 2.0 44/38 valves, double valve springs (ported/polished)
Rod Ratio 2.039:1
Deck Height .04" (1mm)
Compression Ratio 11.5:1
Cam 86b/c or 163/86b

Induction Weber 40 IDF
Exhaust Kerry Hunter 1.5" header

Again, I appreciate any and all constructive feedback.