Base timing. Really ?

185/190, does not compute at 9.4 Scr and 284cam in at +2

As to that cam there are two versions; one is on a 108LSA, and the other is on a 114; So your Ica could be either 68* or 74*
Using the 74* and assuming an elevation of 900ft, the Wallace Calculator spits out a pressure of [email protected]
To get 185plus psi,the Calculator wants
more than 11.7Scr @68*, and more than 12.4Scr@74

If your pressure is accurate; and your heads are iron, then you have a big problem. Since the engine is still together after 18 years; IMA guessing the pressure is NOT accurate. And since the problem is only at below 3500, Ima guessing the Scr is NOT accurate either.
But;
just in case both the pressure and the Scr ARE correct, I tried to force the Calculator to spit out a 185psi number with a 9.4Scr, by manipulating the Ica, and had to go down to an Ica of 48*. I do not think there was ever a BBcam made with such an ICA, and I would think that if your 284 cam was retarded 20*, there is no way your engine should run ; so
IDK

If i remember right, it is the 284/484 with 108..it was the original grind before they came up with the second one..i know i never actually did any measuring as far as coming up with the compression ratio, i just went by the compression height of the pistons which is 2.061 which is supposed to be somehwhere around .20 down in the hole, and then the open chamber 452 heads which are 88cc i believe and the thicker head gaskets..The pistons are the TRW L2355.