This is GMs 290hp 350 that they show with different heads in an attempt to sell them.

Notice the first power curve. I figured out the cam they used so I know I can pump up the torque at 1800rpm.

However there is a power increase from the use of Vortec heads. This is surprising as these heads have big port sizes 165 to 170, however it must be due more to the combustion chamber.

Notice it is making 300ft/lbs at 1800rpm, 300 :- 350 = .86 X 305 = 261ft/lbs

So we know if we want to get 300tq from a 305 we need to make it even more effent

Std 305 then with a short duration cam, headers manifold and valve pocket porting. Hard to say if the engines will really respond this well. The biggest improvement was from the head modifications so I am skeptical.

Then a stroker 305 and a 350. Torque is the top curve HP the lower

 I calculated the V6 engine from Hardy you showed me at 50HP X 5252 :- 1760rpm = 149ft/lbs seems reasonable 169ft/lbs @ 2640

262 V6 and 305, everything else the same.

Hardy 305 60HP 179ft/lbs @ 1760 179ft/lbs @ 2640 Flat torque curve very encouraging. Interesting same stroke as V6 yet the curve is flatter.

I expect Hardy isn't modifing the V6 motor much but I'm skeptical we can push it to 300ft/lbs on NG

Once again numbers vary from dyno to dyno even though they shouldn't.

At 1760rpm both Hardy's 262 V6 and 305 V8 are making 0.19tq per cid.

His 454 makes 0.99 per cid showing it is easier to make effecient power with bigger motor, something most people don't get, liitle motors give you less bang for your buck, but you've got to like big bangs first.

His twin 454s seem to loose power, and his headers are a bad idea.

I think this guy tells the truth and we can only expect modest increases, however a compression ratio increase and cam may surprise us.

My 590 made 1.17tq per cid on gasoline figure better than 1.0 on NG but with 11.5:1 CR it should increase to 1.22 per cid on petrol.

Looking at his 350 it makes 200tq give or take from 1600-2600rpm, he is doing something (0.60tq per cid.)

V6 with compression ratio increase and comparing NG fuel

245tq is 0.93 per cid at peek

285tq is 0.97tq per cid

Notice the flat tq curve under 2000rpm 417tq that's 1.1tq per cid. Better heads and truck manifold

I found that 8 coils cost less tham the distributor front cover conversion