The EP377 is the '95 454 TBI pump rated 30 psi. The EP381 is the vortec 350 pump rated around 60 psi. I prefer the 377 because it will be operating at closer to its rated pressure. Either will...

I prefer to check by the throttle body. But unless your filter is plugged you should be close. 18 psi with a stock spring makes me think the spring may be bottomed out. You'll need a stiffer...

Have you done any tuning with the Vortec heads? If not, you're leaving a lot of performance on the table. I like your choice for a cam upgrade, and it should be good for 50 hp over what you're...