No, you can't substitute pounds for gallons, and also the gravity of the syrup is probably not 1.032, that is probably the potential SG. The way you've got it the gravity dropped when you addded syrup

If the potential SG of the syrup is 1.032, that's per pound in one gallon of water - you can estimate that 1 lbs of syrup is 1/12 of a gallon, based on honey weighing about 12 lbs per gallon. This gives us an estimated gravity of 1.384, which is a bit less than the SG of honey. 4 lbs is about 1/3 gallon, so it becomes:

(6.5*128 +(1/3)*384)/(6.5+.33)=

(832+128)/6.83=

960/6.83=140.6

So you can estimate your OG was 1.141

There's a lot of estimates in there though.