is 2L per minute enough for a twin carb 4age u reckon?
i think its enough but not sure.

Stock pump would only be 4-5 psi for carby so 2lt pm with return sounds ok but if no return sounds a bit much and build pressure

That's good for 200 hp at least

200 HP only requires 1.2 liter/minute

Interestingly the stock A14 mechanical pump does 1.3/minute. Datsun make good stuff.

Return line is not needed. A good pump will stop pumping when it reaches the max pressure. However some cars have a metered return line, so that lowers the effective pressure a bit with high-pressure pump. Not a worry with a 3.0 psi pump or regulator.

i think its 2 - 5 psi its not what i was looking for, originally wanted another carter, but it looks like it should do the job,its made is nz so i got faith in the sheep rooters build quality.

i put a pressure guage after my stock a15 mechanical pump a few years ago and it was alot higher than expecting,was 5.5 - 6 almost i think.
thanks

For best fuel tuning, you should use a regulator to get the pressure to where the carbs want it ... all my stock fuel pumps have been in spec, so I didn't run a regulator. Weber sidedrafts are recommended at no more than 3 psi if I remember correctly or was it 3.5?