I want more power - Shafiroff 540 or LS?

[Ekliptix]

I bought a used 402 BB with heads/cam a cpl years ago, to replace my 350. The seller claimed the 402 made 430hp, but after a lot of time and money for parts, professional dyno tuning and transmission adjustments, etc the motor is a dog and only made 300whp on a chassis dyno. The motor is just tired. I've yet to take it to the drag strip post tuning, but I'm estimating low 14's at 95mph, as it did mid 14's pre-tuned. I'm not satisfied with the power.




The drivetrain is ready for more power. TCI 700R4, Eaton dif.

I learned my lesson buying a used motor.

I'm leaning towards the most mild 540 Shafiroff makes:
https://www.shafiroff.com/chevy-pump...realstreet.php

540 Pros: compatible with my accessory brackets, transmission, headers, I can make it look OEM-ish with paint, valve covers, etc. No modern computer, gauge retrofit required. My existing Holley Sniper kit is within the 650hp max for the injection capacity. I'd likely change the current 3.73 gear to something more street friendly to take advantage of all the engine torque.

540 Cons: My TCI transmission is rated at 500ft-lbs. The motor above makes 640ft-lbs. I am at 3500ft elevation, so that works out to approx 570ft-lbs at my elevation.

Or, some LS motor. I originally wanted to go turbo LS, but the initial quote (in canada) scared me away. I've since spent more on this BB setup then the LS turbo quote.
LS Pros: Less fuel use, potentially more reliable in the long run.
LS Cons: More money and time for parts: accessories, transmission adapters, gauge stuff, computers, exhaust, etc.


Just writing this all out, it seems sticking with a BB is the less painful route.
Any other opinions?