Although both cams tech recommends are similar to the 3863151, they will give much quicker throttle response over the 3863151 cam because of their quicker ramp speeds. MHO, the OEM 3863151 cam while it performed well back in the days, it was lazy by todays standards. If you can afford it, go with the roller cam. And as I remember, this is going into a T Bucket, they don't need a lot of low end torque with their light weight to get up and scoot.