christmas idea, engine swap?

[DarkFox1]

hey yall, I dont usually post on this forum heh, not really my cup of tea, although I do like the 73-87s.. but my dad has an 86 k10 currently with what I THINK is a 700R4 and a 305. The 305 is tired and I was thinking for christmas I could help him out a little since I can't afford to buy him a new truck. So I got this 4 bolt 350 with a high nickle content SBC engine that I pulled running out of my 71 c10 project 3 years ago. It's been sitting on an engine stand since I pulled it just.. looking ugly. Since I'm doing a vortec 5300 swap in my c10 I dont need this motor anymroe and wanted to know if theres any rough waters to put this 350 in my dads 86 in place of his current 305. I dont know what parts I'd need to rob off his 305 to make it work and whatnot? and emissions?

any info yall can give me in advance, including how to sneak an engine block out of the garge lol, would be very helpful.