Sb stroker planning... performance gain?

So i'm planning on building a new bottom end for my small block stroker in the future and wondered just how much better it will run...
The heads and cam specs will likely not change. Just wondering what an updated bottom end will yield.
Current motor:

408 bottom end (4.030 x 4" crank)
'75 360 block
K1 crank and rods
Diamond flat top pistons with 1/16",1/16", 3/16" ring pack
Final compression ratio comes out to 10.3 to 1
Indy 360-2 heads and intake converted to dominator flange by W5Dart66
flow specs on heads intake side:
0.0500 52.7
0.1000 81.8
0.1500 111.8
0.2000 143.27
0.2500 174.1
0.3000 203.3
0.3500 231.9
0.4000 257.2
0.4500 280.5
0.5000 298.02
0.5500 309.56
0.6000 319.7
0.6500 324.47
0.7000 331.71
0.7500 332.89

Cam is a solid roller by Predator cams
INTAKE .436" lift 264* @ .050" 297* @ .020"108LS
EXHAUST.436" lift 268* @ .050" 302* @ .020"108LS

Cam is .698 gross lift with my 1.6 rockers

Current best is 10.04 @ 131.78 in my 3000lb valiant

Now, i'm planning on building a 427 bottom end using:
4.060" bore x 4.125 crank
R1A block (340 main, 48* block)
4.125" BPE crank with 2" rod journals
Flat top piston with .043,.043, 3mm ring pack
Callies compstar rods, 6.200"
Final compression ratio at 11 to 1

Now i know these engines are not drastically different, but there are a bunch of small differences, and i wonder how they'll stack up.

What do you all think the difference in et/mph will be?

I would think 2 tenths better.

im thinken the same because the extra weigth of the block

Quote:

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im thinken the same because the extra weigth of the block

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You've got a point there, but it should also be more stable are RPM, as this is a 4-bolt main block compared to the factory. And, the cylinder bores should be more stable.

I'd like to see 700 hp out of this motor, but not sure if it can be done on pump gas... Maybe i should just build it as a 13.5-14 to 1 motor and look into E85.