Yep !!!!!

Sometimes, just because something CAN be done, doesn't mean that it SHOULD.

Rememebr that.

OH,,,i agree,,,i am not saying i would ,,,but it can be done !!!

The 500HP, 540 cube Bulldog did use a Bowtie block and Lunati crank. The stroke is most definitely 4.375. The bore would be around 4.43 to make 540 cube.
I don't think you can put that crank into a standard deck GM block.
I suggest you try and have the block sleeved. Buying a new block is going to be big $$.
It all depends on how much you want to spend on a boat that is for sale.
If you do really want to sell the boat the easiest and least expensive thing to do is buy a "take-out" running engine or buy a shortblock 502.

Here's what I found doing a quick google...

HP500 Bulldog Specifications

Propshaft Horsepower: 470 (350 kw)
Displacement (Liter/CID): 8.9/542
Cylinders: V-8
Bore (in/mm): 4.44/113
Stroke (in/mm): 4.375/111
Compression Ratio: 8.6:1
Fuel Requirements: 87 Posted Octane (R+M)/2
Full Throttle RPM Range: 4800-5200
Ignition Type: Thunderbolt V
Alternator (amps/watts): 55/776
Length (in/mm): 47.5/1207
Width (in/mm): 32.75/648
Height (in/mm): 25.5/648
Weight (lbs/kg): 1540/699
Warranty: 1-year limited, 3-year limited corrosion

Thanks for the help I took the motor the the engine shop today getting the block sleeved and the heads crank etc all checked out and reballanced

Who did you take it to? Always curious as to who else is out there doing thi kind of work?

I took it to houston engine and balancing in pasadena

Can you PM me their pricing sheet?

That's good news.
Are you going to put the same cam back in?
If you have a little extra, you may consider bumping the compression and installing a good hydraulic roller cam.
9.5: 1 and a cam simmilar to the 525EFI cam will give you another 50-75HP and still idle around 800rpm.
Good Luck with your project...