That's what I have now... also. So I wonder if I'm out of pump also ...

 

I would assume you probably are if powering that 383. Best way to find out is throw it on a throw a Fuel pressure gauge on it. That's how I found out. I don't know what the stock pump is good to as the pump I was running was a NAPA replacement pump. I went ahead and went to the 255 for a couple of reasons.

1. Obviously I needed a higher volume pump.

2. For $100 and an hour of bucket modification, it's a way better idea than trying to find a drop in high volume pump and assembly.

I believe it was Atomic that built an awesome spreadsheet that shows where your power limits are using different pumps and different sized injectors. There is a thread I believe in the fuel section that you can download it. You can input different pump volumes and different sized injectors to see where your limits are, I would recommend this for you, because I don't know how well the 8.1 injectors would do on a cammed 383. I would assume they'd be ok, but without any hard data it's hard to tell.