Well that's just a little too vague; which purple and exactly what compression ratio? If you don't know, then a cylinder pressure test could be helpful. I'm sorta seeing the common teener blues here, which is total lack of compression. But I'll wait for the numbers, before commenting.
But here's some food for thought, The biggest reason so many teen owners are disappointed,after a cam upgrade, is the lack of low-rpm grunt, which is directly related to the lack of compression, and not enough rear gear, and TC if an automatic . But that can and does happen with other SBMs to.
Going from 8/1 to 11/1 represents about 5.2% power gain so about 12 hp on your engine, which doesn't sound like much, but this is at peak power. The difference in torque at part throttle, and especially below 2500 rpm is almost profound. So if you have a 3000TC it's not an issue. But with a stick car that might be a difference of 16 or more crank-footpounds at, 15/20 mph depending on rear gear. In first gear, after TM, that could be over 40ftpounds at the pavement.And that is very significant. Don't let anyone tell you that 9/1 compression is enough. Without a qualifier, 9/1 means nothing. (although 9/1 in an otherwise stock teener would really wake it up),
The intake closing event and the Scr are intimately related.
For instance;If you've got a 292/108 in there,in at 104, with a 70* ICA, that cam would need a lot of compression to pull up the bottom end; like 10.8Scr,and the bottom end could still be softer than a stock 8.0Scr 318.There is no good way to get 10.8 on a teener with those heads; you would be looking at a total chamber volume of 67 cc.That's heads,deck,gasket and piston tops.
If your pistons are down in the holes, that could be your biggest problem. There may be other issues; like lack of stall and gear. If you put that top end and cam onto a 360, it will have similar problems.It still wants a 10.8Scr, but now in a 360 that takes 76.3cc, which is a lot more doable, but not with pistons down in the holes either.If you put all that stuff on a stock 8.0 360, it will be a worse slug than a stock 318, up to maybe 3000 rpm(guessing).
I had a 367 with that cam and 11.3Scr and the bottom was still too soft for me, and that was with a deep starter gear (manual trans). I didn't put a lot of miles on that cam, and then I sold it .That cam is best left for a race-track only environment.It pulled gangbusters after about 5300, and was still pulling at 7000.But the first 20/25mph were miserable. And really,7000 in first gear with 3.55s is already speeding almost everywhere in Manitoba. A power peak of 5300 would typically occur at 45 mph. That's like forever, when trying to catch a BB-car,lol.
At 3330 pounds; The 14.4 with street suspension translates to about 227 hp. the 94mph says 228. So it looks well sorted, if a bit anemic..
This post abbreviated for Rumble,lol.