SBC 1 5/8 long tubes

[SavageZ28]

Hello so I just picked up a pair of sbc long tube 1 5/8 headers for $80 and I was so wonder I g what the gains usually are for 1 5/8? And will these work with the lt1 heads? They guy said they are off a sbc. The specs are 1 5/8 primaries with 3" collectors. And I am not sure they are long tubes since ive never seen a pair in person or are the mid lengths? For some reason the image isn't uploading -_-