Gary, i happen to think Plasticine is good for cetain applications and it's nice to see u carry them yourself, on this occasion I don't think they will be suitable as they tend to go a funny colour when the come into direct contact with engine oil.
Why not send me all your std rods and i'll get them processed for you as per your bullet proof set send them back to you and you can charge £700, a nice mark up from the £300 per set it'll cost to have your rods sorted.
Without doubt to me it makes sense for me to buy std rods and process myself.
I may be in the market for an R32 gtr block, do you have any extra plasticine lying around ?
G.