It would be on the low side for sure but as long as you pressure is increasing with higher rpm's you are OK. Hold your trottle to 1000 rpms and see what you have. You can use a thicker oil to get a little more pressure as well. Try the Rotella 15w40 diesel oil with a Delco filter. Its a little thicker, cheaper, and has enough zinc and prosphorus for our old school motors.
FYI,all you die hard rotella guys need to get with the program and read the oil info that's been posted here since 1/2007/almost 4 yrs ago all over team chevelle that as of that date rotella's newer CJ rated 15w-40 diesel oil didn't have enough zddp to safely protect anything but very mild stock type ft cam/lifters anymore like you would use in a stock 283/307/or low perf smog 350 & even thats pushing it IMHO.
But shell's older CI rated 15w-40 Rotella diesel oil that was mfg'd prior to 1/2007 did in fact have enough zddp to properly protect aftermarket hi perf ft cams .
But chevrons delo 15w-40 diesel oil in the newer post 1/2007 CJ rating does in fact still have enough zddp at 1300ppm to safely protect stock to moderate lvl ft perf cam.
As for the 10w-30 syn oil he's running,if he's running a ft perf cam & its std over the counter run of the mill syn pass car 10w-30 oil then thats not good at all which will likely lead to premature ft/lifter cam failure because it doesnt have enough zddp either like most any over the counter oils sold today with exception of a few like the delo oil,valvolines VR1 race oil also avail locally with 1400ppm zddp,mobil 1's Nascar endorsed hi perf race 15w-50 syn oil with 1300ppm zddp,and a few other full syn hi perf oils like amsoil/RP/etc also offer a few oils with elevated zddp to help protect hi perf ft cams/lifters too.
But the over the counter run of the mill 10w-30 oil has approx 700-800ppm zddp when a minimum of 1300-1400ppm zddp is required for safe hi perf ft cam/lifter protection,see the point?
Since 1/2007 the latest of mult madates by the Gov/EPA to reduce zddp that has now led to unsafe low ZDDP lvls for hi perf FT cam use in most oils sold over the counter today.
That's due to gov/epa reg's & or madates to do so due to the higher lvl of zddp that hi perf FT cam's require for normal srv'c life actually fouling cat converters over time & miles leading to increased emissions.
I prefer to run Spectro's new Golden motor guard series hi perf oil with 1,800ppm zddp for ft perf cams marketed under summits name for a little less $ then if you buy it dirtectly from Spectro oil.
It's avail in conven and conven /syn semi blend in 30wt/10w-40/20w-50 grades.
Summit runs sales on it once in a while too so whatch for that,there's a sale tab on front page of summits website so you can keep an eye out for oil sales checking there every so often & then stock up hen you see a sale.