I'd go with the larger cam. A 2801 works very good in a 400 engine around 9.5 to 1 compression, the larger 455 at the same compression ratio will like about 10 degrees more duration.
We also have to keep in mind here that a larger cam tends to make the engine more pump gas friendly.
FWIW, if I were building the same engine here, it would get a RAIV sized cam, a set of Rhoad's lifters, and high ratio rockers. I'd also be tempted to put one of Ace's Wolverine 5059 clones in it, but since we quit using flat cams here quite some time ago, we haven't tried any of the newer offerings. I'd also cut the heads just a tad and put the compression closer to 10 to 1......Cliff
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https://cliffshighperformance.com/
73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),
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