I have an 87 t2 with a full 3 inch exhaust walboro fuel pump(i thinks it either a 225 or 255 not sure came with car) with a avcr and afc from apexi. im wondering what injectors i should upgrade to? the stock fuel system is at about the limit. are there any factory injectors that would be abetter upgrade such as fd or something of that nature? any help would be appreciated.