PUMPKIN? gravity per pound of pumpkin?

Planning a pumpkin beer for fall. Pumpkins are growing nicely in garden...

How many gravity points can I count on per pound of fresh pumpkin? will be using 3-4 lbs of pumpkin baked at 350° for 1 hour prior to using in mash.

Here's the recipe I came up with:

3-4 lbs pumpkin
6lb american 2row pale
1lb vienna
1lb munich
.5 60lvb crystal
.5 carapils

.5 oz amarillo 60 min
.5 oz amarillo 45min

1tsp cinnamon
3/8 tsp nutmeg
1/8 tsp mace
7grm sweet orange peel

US-05 american ale yeast

specs without pumpkin:
OG 1.044 (higher with pumpkin but how much?)
FG 1.011
IBU 25
ABV 4.3 % (higher with pumpkin but how much?)
SRM 7

It's been my experience that pumpkin will not add any significant gravity to your beer.

Interesting. may need to add a bit of DME to boil to raise ABV a bit. (I have a feeling this may max out my 5gal mash tun!)