Stuck on engine direction

[analyte]

I'm really struggling right now with the engine choice. I have the following platform to build upon:



66 Chevelle
454 BBC w/ 357hp and 476tq at rear wheels
T56 w/ 3.73s
19in BBS RS-GTs
Ordered Kore3 C6 brackets for front and back
Will soon order SC&C Stage2+
Will soon order Currie upper and lower control arms
Will soon order Hellwig Pro-touring rear bar and front bar

I had planned to add Holley's HP efi with an Edelbrock Mini-ram EFI intake, but I'm looking at the price of EFI and comparing it to a 6.0 LSx. I'm sure I could sell off the BBC in pieces, but I'm not sure which direction to go.

I will take it to the strip at times, but I'm more interested now in running cones and maybe track days. I know the weight of the BBC is a factor, but the LSx has it's issue too I'm sure.

Has anyone swapped from a well-tuned BBC with EFI to a LSx with at least a cam upgrade? Did the mileage improve (I get around 15-16 on the highway currently with the OD)? What about driveability withe a stick as the T56 limits my choice if I want good street manners at low speeds.

BTW, my budget is around $4500 to get it in the car if I go LSx stock as I want to drive it this summer. Mods such as cam, etc will come later. With long block 6.0s going for around $1000 in my area, that leaves about $3500 for LS1 intake, ECU, harness, etc.

Thanks,
Kerry