To run 8.90 @2800 your going to need minimum 750Hp tall order for a G3 @ that price point.
426CI is the minimum 4.09X4.05 is the easiest way there , 6.2 rod yields a rod ratio of 1.53, the more common build uses a 6.125 rod and yields a RR of 1.51 A 440+CI will use a 4.25 crank and the 6.125 rod yields a RR of 1.44 and a 1.01-03 Pin height hockey puck type piston, a 6 inch rod gives an RR of 1.41 and a more stable 1.12-1.14 PH (all #s based on a 6.2/6.4 block, 6.1 block - .03 for PH’s) now a 426CI with a 4 in stroke is 4.12 Bore ,RR with a 6.25 rod is 1.56 but here again your looking at a hockey puck piston.
Personally, avoid the 6.1 block unless you can get a good one for under 1k. at a 4.09 bore those blocks are thin, you would need to fill the water jacket half way for a NA engine to hit that type of NA HP #
Aluminum block is out @ your price That leaves a 6.4 core engine, which in reality you’re only going to keep the block, heads and timing cover, the crank is a nice piece but is only 3.724 stroke, rods & pistons won’t take that HP abuse for long.
So……. here’s some prices from scratch no core engine +/- $100 no shipping cost included
Hellcat Block= $1400-1600
Apache Heads pair =$1400-1800
Crank =$1000
Rods= $650-1000
Pistons+ $650-1200
Drag Pak or Ritter intake =$700-1000
Cam=$650-1000
Timing Cover=$250-450
Oil pan= $350-700
Max price for this shopping list is $8750 and we don’t have any fasteners, valve covers and rockers included or machine work .
Now these are all new pieces no used parts in this list. Min Price for this list is $7000
Not saying that this price can’t be beat, depending on who you know and who can help you out with prices.
Here’s the tricky part to a 750+HP G3 Hemi, Rockers…... to hit 750HP your going to have to spin it high over 7000k RPM, stock rockers will go to 7000 gray area seems to be 7300-7500. Above 7200rpm I would suggest T&D Rockers but now your adding another $2800-3400.
8.90s are achievable ,budoboy has don it, with a 440ci Alum G3 @ I think 3000lbs maybe 2800 not 100% sure on the weight.
https://www.youtube.com/watch?v=PSBeSfrvko8

The 426(SRT392 block PN5037471BF) I built for Clayton has gone as fast as 9.90 @ 138 in a 4000lbs 2010 Challenger once and only once it’s a good constant 10.10 car I figure it’s in the 750-800hp range, he’s going thru the traps @ 7500 and we have replaced the stock rockers 3 times so far.