1972 Duster Project

I pulled the 340 out of my Duster for a rebuild. I'm looking for some advice. I planned on putting Edelbrock aluminum heads on the car but a fellow MOPAR club member has offered to sell me his 70 X Heads ( they have had an $800.00 polish/port job) for $350.00 for the pair. The heads have about 4K miles on them. That would save me a grand versus the Edelbrock heads. I know I'm sacrificing some power but I am on a tight budget and saving a grand sure would help a lot. But I also live by the rule of "you get what you pay for" so I'm concerned that I may be jumping over a dollar to grab a quarter. Your thoughts please. Thanks...Doug.