Bones, I know nothing about them.
An important distinction before further talk is rwhp vs. fwhp rear wheel vs. flywheel, looking at maybe 12% losses best case or when you use a "happy" dyno like Golen does his customers typically see more than 25% loss at the tire. Even his fans will tell you his 520hp 396 is unlikely to put 400 to the tire. Losses are greater with the automatic tranny, all numbers going forward are assuming automatic, when researching remember a lot of LT1s had T56s behind them which is very efficient and results in a higher hp number at the tire.
Really IMO a stroker build when you have a perfectly good 350 is a waste, either needs thousands in exhaust, fuel, tranny, suspension mods so we will call that a wash and not talk about those figure right now.
The heads and cam can take a 290rwhp bolton car and push it to 400rwhp(some better setups 425rwhp) for $3000 if honest about gaskets, fluids, core heads, valvetrain yadda yadda. Now a stroker needs good heads and cam so you have at least that $3000 number already, but then by the time you buy a good forged kit and have it well machined and balanced, assembled you are in another $3500 and that $3500 will get you maybe 20rwhp in most cases if willing to use a larger cam to go with the larger displacement so it isn't even really the displacement adding all the power. Now granted it will have more lowend torque BUT with the 3.06 first gear in the tranny, as well as overdrive and lockup allowing 3.73s to be very comfortable, a 6500rpm heads/cam motor should make nice off idle torque anyway. The compression the LT1 likes helps a lot with that, most heads/cam setups are 11.2-11.5:1 and built moors are often 12-12.5:1.
Displacement is the first thing newbs want to do but in reality is is the last thing you should look at, it is the most expensive way to add a modest mount of power. I have even seen guys in a blind quest for displacement NOT add power, hell one kid managed to have a 383 with headers make 220rwhp which is bone stock number. When considering 260fwhp stock that is about 15% drivetrain loss, but things we do like deeper gears and higher stall make drivetrain losses rise even though they add a lot of performance.
Before it comes up the opti is fine, I haven't had any trouble with stock ignition even with an engine that has seen 7000rpm and has cranking compression of 245psi.