The BOBSCARDZ comment is not accurate. The puzzle grid is actually laid out in this fashion:
        A        B        C         D         E         F         G         H         I                J        K
1-A1        B1        C1        D1        E1        F1        G1        H1        I1        J1        K1
2-A2        B2        C2        D2        E2        F2        G2        H2        I2        J2        K2
3-A3        B3        C3        D3        E3        F3        G3        H3        I3        J3        K3
4-A4        B4        C4        D4        E4        F4        G4        H4        I4        J4        K4
5-A5        B5        C5        D5        E5        F5        G5        H5        I5        J5        K5
6-A6        B6        C6        D6        E6        F6        G6        H6        I6        J6        K6
Upper left corner is A1, lower left corner os A6, upper right corner is K1, and lower right corner is K6. MLB logo is on E6, F6, & G6.

The puzzle backs -- 66 different pieces -- form a photo of a 1977 World Series game in Dodger Stadium. The backs are vertical (on 1979's puzzle, the backs are horizontal).

The following blog does confirm the master set is 132, 98 front designs with 34 puzzle-back variations. I have been able to confirm 130 of these, through my collection and eBay. I have yet to see a 4th Cardinals hat sticker or the Angels hat sticker with the "little white circle," as the blog states.

http://fleersticker.blogspot.com/2008/06/1978-fleer-grand-slam-hi-gloss-baseball.html

I have accounted for 130 different front/back combinations, so far. I believe the total number is 132, like the 1979 set, but have not been able to confirm.

Back puzzle complete in 66 pieces. There are variations where the same front stickers will have different back puzzle pieces. While not numbered, I have designated them by row (letters) and numbers (columns), starting in the upper left corner. Thus the upper left corner puzzle piece will be designated A1, while the lower right corner will be K6.