305 upgrades?

[Gmc-76]

Hello all, my names Andrew and I've been lurking here for a couple years and finally decided to jump in. My current truck is a 85 gmc c10, 305 and a turbo 350, 2:73 rear. I had a 86 c10 with a 305, 700r and a 2:73 rear, it had a eldebrock intake and carb and long tubes. I don't know the specs on the carb or intake, they were on there when I bought it. Anyways, my current all stock 305 is crap. It's very slow and sluggish and the truck won't even make a tempt at a burnout. The 305 that was in my 86 would burn the back tires right off the truck no problem and was faster than my dads 2011. I want to know how to make this 305 lime the last one I had. Any ideas? Thanks