L-head or F-head?
Definitely get the manuals -
http://www.portrayal.com/manuals.html
Truck 1/4 Ton 4x4 (M38 Jeep) (G740)
Operator and maintenance. 351 pages. #TM9-8012 $39
New important supplement to above. Changes thru #3. 8 pages. #CH-8012 ... $4
Engine and clutch, 140 pages. #TM9-1804A ... $24
Power train, body and frame. 202 pages. #TM9-1804B ... $28
Complete parts listing. 408 pages. Illustrated. Stock #ORD9G740 ... $59
Carburetor service. 32 pages. #EX-637S ... $14
Truck 1/4 Ton 4x4 (M38A1 Jeep) (G758) (M170)
Operation and repair. 390 pages. #TM9-8014 ... $39
Important supplement to above. 44 pages. #CH-8014 ... $10
Engine and clutch. 185 pages. #TM9-8015-1 ... $27
Power train, body and frame. 311 pages. #TM9-8015-2 ... $39
Power train, body and frame. Important supplement to above. 34 pages. #CH-8015-2 ... $7
Complete parts listing. Illustrated. 449 pages. #ORD9G758 ... $59
I also recommend these (click on title for link to Amazon):
Jeep Rebuilders Manual
Engine Builder's Handbook