i do recommend you go with atleast 1.8 liters of displacement, but the only thing i dont like about the gsr is that it is casted with an "open web" block design, which when refering to strength of a block is weaker. i suggest and onld B18A because it already has a brether on the back and they are a dime a dozen, build it boost it, spray it.

and im sorry but a CTR motor is only like 2600.00 add a 1,000 to that and thats probably NOT what you will get for that motor