Your 261 was only offered new in the big trucks and they all had governors set at 4000 rpm, so don't be afraid to wind her up...get the rpm's up and keep the up and you'll do fine!
Let us know how it goes,
Mike B
Mike Boteler
1956 Chevy 3100 Resto Rod 1952 Willys M38 Army Jeep 1983 Jeep CJ7 Laredo 1984 Jeep CJ7 +++++ Silver Spring, MD