send cam to be reground, quick question on specs

I am sending my cam to oregon this weekend for a regrind and had a question on the specs.

motor is a stock rebuild 5.9 mag. new bearings, rings, gaskets. heads are heavily ported mags, .028 head gasket, around 9.5:1 compression. M1 single plane, 750vs holley, 1-3/4 long tubes, 3" race bullets dumped under the backseat. trans is a built 904, 3.55 rear gear, 275-60-15 mt et street pro radials. i will pick the converter once i get the cam and talk to ptc. car should weigh 2800-3000 lbs. mostly a track car will be street driven some aswell.

The grind im looking at through them is grind 1427
http://www.oregoncamshaft.com/Hydraulic-Rol-Cam-Specs.html
i am also running 1.5 chevy rockers so the specs will be
300-306 dur
242-248 @.050
110 lsa
.358-.373 lobe lift
.537-.560 lift with 1.5 rockers

i am limited to .550 lift due to the the valve springs, so i will have them go to .550 on the exhaust lobe. my question is should i have them do .550 on both intake and exh or leave it a spilt pattern. The motor will see nitrous thats why i was looking at the split profile, but i have read that the magnums like same spec cams in relation to the int/exh.

So im just looking for some advice before i send the cam out so i know what specs to give them to grind it to.

Thanks