I used some aftermarket rams horns that came from Dorman Products on a job a couple of years ago. They were relatively inexpensive and seemed to be of good quality. I see lots of the standard 2" manifolds at swap meets but the 2 1/2" originals are becomming scarce and pricy as well.
Fred


1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine