Got a Bogging Issue

[Zonaman]

I’ve got an engine bogging issue. It only occurs when I’m on this one stretch of highway always at about the same place. I’m hauling my boat to the lake (700R4 not in overdrive). I’ll do about 20 minutes at 65 on the freeway, exit and do I’m doing a few miles of surface street driving with a few stop lights. Then I’ll get on this stretch where the speed limit goes from 45 to 50 and it’ll bog down a few times on acceleration. Then it’s fine. Only does it on the way up- a gradual incline the whole way in. This is Central Arizona so it’s usually around 100 and the engines pretty warm but not overheating. I’ve got HEI and an Edelbrock 1406. Any theories who the "Boggie-Man is? Thanks.