You can get a bolt kit just for this swap.
As far as the comp goes, it would be close to what you have now, both models changed the cc of the chamber, but not alot. smallest 289 is 53ish, while most 351's are 60ish so if anything you'll lose a little comperssion, but not alot. What years are the heads your swapin? Casting numbers would be helpfull too.
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93LXcopcarSOLD14.3@96 @ 4500ft 2.02 60ft on street tires.
my 67 ranchero NOT A 390 ANY MORE! 460! 3.70's cast manifolds, comp cams 262H, performer, 750DP 100K out of 79 F250
NEW(oct20/02)14.58@95mph 2.3 60 ft
corrects to:13.86@100
66 merc comet351w, isky roller 600 lift 268/260@.050, vic jr. 700DP, 5000stall, 4.56's c-4, 3400lbs with driver
12.3@110 @ 4000ft 1.69 60 ft
corrects to:11.69@115
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