new 67' LWB, got a few Q's

[tmc1986]

Im new to the 67-72 truck world. always wanted one and so i finally bought a 67 c/10 LWB 2wd. its got an older targetmaster 350 crate engine and the original 4 speed and rear end. the truck is a good driver that im working on whenever i get the chance. the body is super straight but it does have the typical rusted kick plates, outer rockers, and floor pans. my questions are:

is it possible to replace the pans, rockers, and kick plates at home? im thinking of ordering the LMC parts and doing it for a weekend project. i have a mig welder and all the other tools i need. i have never done any kind of body work like this before and was hoping it was relatively simple. i searched the forums but it didnt make me feel any more confident. should i just pay someone to do it right?

my other question is about that targetmaster crate motor. i researched them as much as i could, i figured its the 4 bolt main, 260hp, 350 ftlbs, mexican cast from 1996. im not opposed to yanking that thing out and buying something new to build but obviously if i can i would like to built the current engine. im looking for 350 to 400 horses. is this thing worth saving? it runs fine but the power is nothing special.

thanks