you can use TWM, throttle bodies, or a carb on a Ls engine, just need to ensure you remain compliant with the emmisisions police depending on the date of the engine. as a new engine (post the emmissions data anyway) itll be subject to tighter emmissions, but that is something you can consider
ive seen ali LS engines completely deburred, mirror polished all over, and blinged with polished and billet everywhere.....
but it really depends on what you want to achieve. but remember pulling the EFI off will leave you with a very nice LS base, but with no more controllability than any old school chevy....so the manners you seek are part of the control mechanism you dont like the look of unless you go TWM or such
DAX 383 ci SBC 440hp...SOLD
GD Euro mk4, 427 C.I. LS7, 540 hp...SOLD
Project Tango "Old School" GD, 440 hp LS3 ....SOLD
460 HP LS Griff now OTR...roll on summer