360 does not seem to be making power and is slow in the 1/8. Need help and/or suggestions

I’ll never understand how issues like a combo that underperforms, where it’s clear the jetting and possibly the timing is off, the tuning skills or better yet “attention to tuning” have not been addressed, yet we immediately get recommendations of changing everything: cylinder heads, torque converters etc etc. My advice is to install an AFR gauge (learn to read plugs later.....fast track carb tuning with the gauge! ) attack that carb circuit by circuit, play with timing. Maximize, learn to tune what you have, then move on to how it launches and runs out etc where then you can replace what may need upgrading