You don't mention what camshaft is going in it but if it's a stock or mild cam any fleet deisel rated oil should be fine assuming the lifters rotate freely and it starts immediately. If it's a larger than stock, say more than 210° @ .050, then you may want the additive too as modern fleet oils are still not very high in zink. Higher than gas engine oils, but not really high. If you have a fast rate of lift and something more than 220° @ .050 then you should look into break in oils. Also - if you have true dual valve springs the inner spring needs to be removed for break in. Personally I like the Valvoline VR1 Not For Street Use - mainly for convenience but it's not much pricier than standard oils and it works well.
