I have found this thread on another forum, maybe inspiration and motivation for you: the guy says he has done all this in 5 months of week ends in his driveway, so I guess you could get your truck running before spring... this guy sure works faster than me!!!
https://ls1tech.com/forums/conversions-hybrids/1910708-my-1954-chevy-truck-ls-swapped.html


'57 Chevy Suburban; '70 Chevy Impala.