Neil- often (my experience) the injectors do not have a mfg name on them. Usually there is a number of some sort. Many are copies of the original Bosch and are EV1, EV6 or EV14 designs. The electrical connector also varies with 2 types being usual. Most have O-ring to seal both the top and bottom and as I mentioned, 14mm orings are common but there may be others. Do you have injectors on hand?
Lots of folks will argue interminably about which will make more power- Injection (CF or EFI) vs a good carb. For LSR a carb is hard to beat though a good CF manifold may help flow distribution and clearly works well. Peak power and who cares about idle, mileage or part throttle. For emissions, mileage and etc features, can't beat EFI for sure. When comparing your situation where there are bungs in a carb manifold the airflow differences and port length differences may be tuned out or improved with EFI assuming you have the capability in the box to tune individual cylinders- and 8 O2 sensors on the dyno to do so effectively. Your engine sounds seriously healthy and I know this is your "test the car" engine with improvements planned. I wouldn't be too hasty to spend the time and money going to EFI. You will spend a ton (don't ask how I know that
) and may not make a real improvement. If you do decide to go that route, I personally wouldn't use that manifold but go to an IR setup to improve fuel/air distribution. As my brothers Latin teacher was fond of saying: "totus porkus aout noulis" (somehow I never took Latin so don't jump on me for the spelling which is undoubtedly wrong). It means "whole hog or nuthin' "