With the single plane intake, sniper and desiring a bit of a rough idle I think you would like a cam similar to the 703 Lunati or the Crower 60243 (size smaller than the 60919) over all the cams mentioned.
My favorite series HFT cams though that I would use if it were my car with a HFT cam is the Bullet 280/288, with the LSA 110, 232*, 240*, .5” lift on both intake and exhaust with 1.5 rockers. It is not the smaller 280,288 mentioned earlier (which is rated at .0045” tappet). It is a later version (very similar to the voodoo series cams, Harold Brookshire designed both) 280, 288 at .006” tappet. It is ground almost identical to the Lunati voodoo series cams but Harold picked the lifts instead of Lunati’ sales reps, and has the same lift on both valves. In a 400 for as big as it is it has good bottom end power. I haven’t found a HFT cam better that it on the street, I have went step above the 280/288 in a 400 with Rhoads v pro super lube lifters, ported 62s heads (250 cfm) and 1.65 HS rocker and headers. Right around .56” lift with that combination, 283/291, 235/243@.050”, 110 LSA.. I had it ground +6 on the advance. It is the closest HFT cam I have found that has Hydraulic roller cam performance with a Hydraulic flat tappet cam. Tim at Bullet was the contact for all those Bullet cams.
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