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 130psi@9.4Scr
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 advanced 20*, there is no way your engine should run ; so
IDK

Here's are some clues;
>if the pressure is correct; that thing should be a wicked beast to drive, with a tremendous amount of low-rpm grunt, that would make it scary to whack open.
> if the 9.4Scr is correct, it should feel way under-powered for a 440, even with the 3000TC.
> if the cam is advanced 20*, it should still be a bit of beast at low-rpm, but choke way too early. and I cannot imagine how it would idle, except to say that there would be a huge amount of energy still in the exhaust.