Fuel return line routing question

[mattpatt]

I'm installing an MSD Atomic EFI on SPF3033. Engine is a 554 hp SB so I went with the hi horsepower optional pump (good up to 620). The pump installation recommends a 1/2" feed line from the tank to prevent cavitation from too much pressure drop to the pre-filter - but the car has only 3/8" hose. There is also the concern that cavitation could occur at the pump inlet if the pre-filter is too fine a mesh (I picked a 40 micron - may be too fine). Seems that running the return line to a TEE between the pre-filter and pump (instead of to the tank) solves all of this and greatly reduces the flow thru the pre-filter (only the engine demand) so it might last longer. It would also reduce flow into the tank pickup which might help during acceleration (sloshing starving the pickup). Also, the plumbing would be easier. This would, however, double the range of pump inlet pressure from ~.3 psi to ~.6 psi. I don't have a vapor lock problem so not an issue but this routing would at least partially help.

Bad idea??

Thx

Matt