N00b question regarding longtubes... and an intro

[Ifixyawata]

Well, based on the forum I posted in and the topic I'm sure that most of you can guess what my question is. But, for the specifics we have an '83 C10 in the garage with the front clip pulled off. The stock, tired 305 will be replaced with a '76 350 from a 'vette. Though, I can't tell which of the two 350's it was for that year. The question, though, is will longtube headers fit in this truck without any clerance issues? I'm specifically looking at the $79 pieces that summit racing offers. These will end up being a gift for my dad. He had a stroke a few years back and can't do much of anything but stay around the house and he's recently showed interest in working on this truck, so I'm sure being able to get out will be a welcome change.