I'm pretty sure there will be significant differences between updraft and down draft.
Here is an application list for the PT-13G1 by specific part list number
390826 R-2800-A CURTISS C-46 R-2800-16 GRUMMAN XF6F-2, CHANCE VOUGHT F4U-3 R-2800-20 R-2800-21 CURTISS P-47G, REPUBLIC P-47C,D, RP-47B,C, XP-47E,F,K R-2800-27 DOUGLAS A-26B,C, B-23, JD-1, GRUMMAN XF6F-1, XF6F-4, F7F-1N R-2800-31 LOCKHEED PV-1,-2A,B,C,D,-3, RB-34A,B R-2800-41 MARTIN B-26B-2 R-2800-43 CURTISS C-46, MARTIN AT-23A,B, B-26B,C,D,E,F,G, TB-26H R-2800-47 VICKERS WARWICK II R-2800-49 HUGHES XA-37 R-2800-51 CURTISS R5C-1,-2, C-46A,D,E,F,G R-2800-71 DOUGLAS A-26B,C, JD-1 R-2800-75 CURTISS C-46A,D,E,F,G, XC-113 R-2800-79 DOUGLAS A-26-B,C, JD-1
392456 R-2800 392457 R-2800-27,-31 DOUGLAS A-26A,B,C, GRUMMAN F7F-1, LOCKHEED PV-1,-2,-3,RB-34A,B 395008 R-2800-35 REPUBLIC XP-47B 395065 R-2800-14,-16,-41 CHANCE VOUGHT F4U-3, GRUMMAN XF6F-2, MARTIN B-26B-2 395156 R-2800-21,-27,-31, -63 REPUBLIC P-47B, C, D, G 395157 R-2800-21 REPUBLIC P-47C,D, RP-47B,C, XP-47E,F,K 395352 R-2800 395376 R-2800-21 REPUBLIC P-47C,D, RP-47B,C, XP-47E,F,K
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