2000 Jimmy V-8 swap?

well, it looks like i either need major repairs to my 4.3 vortec, or do an engine swap. since i really would not mind one bit, MORE POWER, the thought of a small block appeals to me. but i have no idea if this can be done or not, or even where to buy adapter kits, etc.. my vehicle is a 5 speed manual, so i will have bell housing, clutch stuff to consider also. i also do not know if the drive line will take the extra power. i am not hard on things, but when i put my foot into it, i do like things to happen. any idea if this can be done, and or where to buy parts? any info on electronics / fuel injection would really be appreciated!