any benefit to swapping heads?

Seriously your not comparing a boss 302 to a 340, a 340 runs circles around a boss 302. A friend I grow up with had 2 boss 302's and I had a AAR and I would blow his doors all the time, boss 302 ports are twice the size of a X head so that's fords problem, I never had a bog coming out of the hole, on a hill or what ever it just never bogged you got some other problem if you think volocity has to do with a bog on a X head motor. get real dude, you read to many storys, just sad.