What size V-8 engines were available in 1964 Bonnevilles? How can I tell what it is, ie. VIN , block # and where to find, etc.?

I'm not sure if ALL of these engines were available for the Bonneville, but these were the V-8'* Pontiac offered in '64.

Engines: 389 V8 (2 bbl) 230 bhp. 389 V8 (4 bbl) 303 bhp. 389 V8 (3x2 bbl) 330 bhp @ 4600 rpm, 430 lb-ft @ 3200 rpm. 421 V8 (4 bbl) 320 bhp @ 4400 rpm, 455 lb-ft @ 2800 rpm. 421 V8 (3x2 bbl) 350 bhp 421 V8 HO (3x2 bbl) 370 bhp @ 5200 rpm, 460 lb-ft @ 3800 rpm

Here'* a site that may help find engine you have
http://www.gtoalley.com/sixfour.html

Go here to help you find the Engine ED #.
http://www.boyleworks.com/ta400/psp/blockID.html

Good Luck.

I checked out the Classic Pontiac website and got some very helpful info that told me I have a 389 4bbl. However I found it to be a very difficult site to get around, got lost and is nowhere as easy as this site!! You are here to stay!! Frank