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Hi, I came out with between 26 and 30. If it was me I would go with 27 or 28 and that's calculated at 3 bar or 43.5 Lbs of fuel pressure. You could always buy an adjustable pressure fuel regulator to fine tune your engine and even get a little more out of the injectors you have now ( assuming they're not too small).
Here's a little info to help you do some calculations of your own. I used software and then this formula to confirm my findings.
First you have to know your engines "efficiency number" known as BSFC.
Here is some target BSFC numbers.
Professional racing engine 0.40
High compression engine 0.50 (0.55 would be about right for you)
Low compression engine 0.60
Turbo/Super charged engine 0.65
If you know your engines Hp use this formula to determine your injector size
Injector Size= Engine Hp x BSFC over
# of cylinders x 0.8
To convert from lbs/hr to metric cc/min use this formula
lbs/hr x 10,5 = cc/min
If you do need injectors they are plentiful and cheap on ebay.
Hope this information was helpful.
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