Last night I ordered a pump harness for my fuel pump. An Airtex. Right after I did the order the thought struck me that with my set up I may need more pressure. I've searched on here and found nothing concerning my question. So here it is. I've done some up grades to my LO5. Heads, cam, exhuast and a 46 MM TBI. I already have a 255 LPH pump sitting here but it's a TBI pump. Should I get an LT1 pump for the increased pressure? I'm going to put an adjustable fuel pressure regulator on it. Also, should I get the LT1 sending unit? I really don't know the difference between them other than the stock numbers.