[kdh454]

Putting a single pump ahead of the selector valve is not ideal. It will be mounted further from the tank than it is designed to operate. The good news is Chevy has already done the hard work for you. Just get a set of 87 tanks, sending units, and the appropriate in-tank pumps (87 R10 pumps do not provide enough pressure). The 87 tanks are externally identical, but have baffles built in to accommodate the pump. You will also need to replace your selector valve with one rated for the higher pressure. I used a selector switch from an 87 and wired it just as the factory did. It is surprisingly easy to do.